Radio network node, user plane function (UPF) and methods performed therein for paging policy differentiation

Abstract

A radio network node (12) in a radio access network (RAN1) and a method therein for Paging Policy Differentiation (PPD). The radio network node receives from a core network (CN1) a Downlink (DL) Protocol Data Unit (PDU) associated with a wireless device (10). The DL PDU is comprised in a Quality of Service (QoS)-flow, is originated from a respective service and comprises a Paging Policy Indicator (PPI) associated with the respective service. The radio network node extracts the PPI by means of a Central Unit User Plane (CU-UP) (12b). By means of the CU-UP (12b), the radio network node informs a Central Unit Control Plane (CU-CP) (12a) about the PPI. Further, by means of the CU-CP, the radio network node triggers paging of the wireless device. Furthermore, the radio network node pages the wireless device (10) according to the PPI associated with the respective service.

The invention claimed is: 
     
       1. A method performed by a radio network node for paging policy differentiation (PPD), wherein the radio network node is comprised in a radio access network and wherein the method comprises:
 receiving from a core network, a downlink (DL) protocol data unit (PDU) associated with a wireless device, wherein the DL PDU is comprised in a Quality of Service flow (QoS flow), wherein the DL PDU is originated from a respective service, and 
 wherein the DL PDU comprises a paging policy indicator (PPI) associated with the respective service; 
 extracting the PPI by means of a central unit-user plane (CU-UP) of the radio network node; 
 by means of the CU-UP, informing a central unit-control plane (CU-CP) of the radio network node about the PPI; 
 by means of the CU-CP, triggering paging of the wireless device; and 
 paging the wireless device according to the PPI associated with the respective service. 
 
     
     
       2. The method of  claim 1 , further comprising:
 informing the CU-CP of the PPI by using a DL data notification message via an E1 interface, wherein the informing is performed by the CU-UP. 
 
     
     
       3. The method of  claim 1 , further comprising:
 receiving, by the CU-UP of the radio network node and via a New Generation User plane (NG-U) interface, the DL PDU from a user plane function (UPF) in the core network. 
 
     
     
       4. A method performed by a user plane function (UPF) for paging policy differentiation (PPD), wherein the method comprises:
 sending a downlink (DL) protocol data unit (PDU) associated with a wireless device to a radio network node in a radio access network, wherein the DL PDU is comprised in a quality-of-service flow (QoS flow), wherein the DL PDU is originated from a respective service, and 
 wherein the DL PDU comprises a paging policy indicator (PPI) associated with the respective service. 
 
     
     
       5. The method of  claim 4 , further comprising:
 sending the DL PDU to a central unit-user plane (CU-UP) of the radio network node, via a New Generation User plane (NG-U) interface. 
 
     
     
       6. A radio network node for paging policy differentiation (PPD), wherein the radio network node is configured to be comprised in a radio access network and comprises processing circuitry configured to:
 receive from a core network, a downlink (DL) protocol data unit (PDU) associated with a wireless device, wherein the DL PDU is comprised in a quality-of-service flow (QoS flow), the DL PDU is originated from a respective service, and the DL PDU comprises a paging policy indicator (PPI) associated with the respective service; 
 extract the PPI by means of a central unit-user plane (CU-UP) of the radio network node; 
 by means of the CU-UP, inform a central unit-control plane (CU-CP) of the radio network node about the PPI; 
 by means of the CU-CP, trigger paging of the wireless device; and 
 perform paging of the wireless device according to the PPI associated with the respective service. 
 
     
     
       7. The radio network node of  claim 6 , wherein the radio network node is further configured to:
 by means of the CU-UP, inform the CU-CP about the PPI by using a DL data notification message via an E1 interface. 
 
     
     
       8. The radio network node of  claim 6 , wherein the radio network node is further configured to:
 by the CU-UP of the radio network node, receive the DL PDU from a user plane function (UPF) in the core network via a New Generation User plane (NG-U) interface. 
 
     
     
       9. A user plane function (UPF) for paging policy differentiation (PPD), wherein the UPF is configured to be comprised in a core network and wherein the UPF comprises processing circuitry configured to:
 send a downlink (DL) protocol data unit (PDU) associated with a wireless device to a radio network node that is in a radio access network, wherein the DL PDU is comprised in a quality-of-service flow (QoS flow), wherein the DL PDU is originated from a respective service, and wherein the DL PDU comprises a paging policy indicator (PPI) associated with the respective service. 
 
     
     
       10. The UPF of  claim 9 , wherein the UPF is further configured to:
 send the DL PDU to a central unit-user plane (CU-UP) of the radio network node via a New-Generation User plane (NG-U) interface.